#class {
  position: relative;
}
#class .context {
  position: relative;
}
#class .left {
  position: absolute;
  left: 20px;
  box-shadow: 0 0 8px 0 rgb(43 51 59 / 10%);
  border-radius: 8px;
  background-color: #fff;
  width: 200px;
  height: calc(100vh - 116px);
  -webkit-border-radius: 8px;
  -moz-border-radius: 8px;
  -ms-border-radius: 8px;
  -o-border-radius: 8px;
  text-align: center;
}
#class .left .header {
  width: 100%;
  height: 200px;
}
#class .left .header img {
  margin: 32px 0 20px 0;
  border-radius: 50%;
  width: 80px;
  height: 80px;
  -webkit-border-radius: 50%;
  -moz-border-radius: 50%;
  -ms-border-radius: 50%;
  -o-border-radius: 50%;
}
#class .left .selected {
  background-color: #f4f5f5;
  color: #3B90FF;
}
#class .left>div:nth-child(n+2) {
  height: 56px;
  line-height: 56px;
  text-align: left;
}
#class .left>div:nth-child(n+2) span {
  padding: 0 10px 0 47px;
  vertical-align: -0.28em;
}
#class .left>div:nth-child(n+2) span svg {
  width: 18px;
  height: 18px;
}

#class .right {
  margin-left: 240px;
  width: calc(100% - 260px);
  border-radius: 8px;
  height: calc(100vh - 116px);
  background-color: #fff;
}